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https://issues.apache.org/jira/browse/HADOOP-13055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16175574#comment-16175574
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Lei (Eddy) Xu commented on HADOOP-13055:
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Hi, [~manojg]
I am new to this I might have some misunderstanding.
{code}
// Is an internal directory
abstract boolean isInternalDir();
// Is a Merge Link or a Merge Slash Link
boolean isLink() {
return !isInternalDir();
}
{code}
Can you add more comments here to clarify what is the concept of internal dir,
and what is the relationship between "internal dir" and {{Merge Link / Merge
Slash Link}}? Or maybe rephrase the names?
{code}
SINGLE_FALLBACK,
MERGE_SLASH,
{code}
Can you add more comments on both of them? What is the difference?
{code}
for (LinkEntry le : linkEntries) {
if (le.isLinkType(LinkType.SINGLE_FALLBACK)) {
INodeLink<T> fallbackLink = new INodeLink<T>(mountTableName, ugi,
getTargetFileSystem(new URI(le.getTarget())),
new URI(le.getTarget()));
getRootDir().setRootFallbackLink(fallbackLink);
}
{code}
How to guarantee that there is at most one {{LinkType.SINGLE_FALLBACK}}
instance.
Thanks.
> Implement linkMergeSlash for ViewFileSystem
> -------------------------------------------
>
> Key: HADOOP-13055
> URL: https://issues.apache.org/jira/browse/HADOOP-13055
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, viewfs
> Affects Versions: 2.7.5
> Reporter: Zhe Zhang
> Assignee: Manoj Govindassamy
> Attachments: HADOOP-13055.00.patch, HADOOP-13055.01.patch,
> HADOOP-13055.02.patch, HADOOP-13055.03.patch, HADOOP-13055.04.patch,
> HADOOP-13055.05.patch, HADOOP-13055.06.patch, HADOOP-13055.07.patch
>
>
> In a multi-cluster environment it is sometimes useful to operate on the root
> / slash directory of an HDFS cluster. E.g., list all top level directories.
> Quoting the comment in {{ViewFs}}:
> {code}
> * A special case of the merge mount is where mount table's root is merged
> * with the root (slash) of another file system:
> * <ul>
> * <li> fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/
> * </ul>
> * In this cases the root of the mount table is merged with the root of
> * <b>hdfs://nn99/ </b>
> {code}
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